Tire press



Feb., 1s, 1947.

- G. H. MrrHE LL TIRE PRESS Filed July 18, 1942 2 Sheets-Sheet 1 INVENTOR Feb. 18, 1947. H. MITCHELL..

.TIRE PRESS Filed July 18, 1942 2 Sheetsl-Sheet 24 Patented Feb. 1'8,

UNITED STATES Pli'ir.Nr,ggoifriet;l I

v ma vPitiizss Geom n. Mitchell, New' York, N'. Y. 'Application .hay is, i942, sel-ilu no. 451,5'20

4 l (ci. ist-o) 2 Claims.y

My invention relates to a tire press for removing tires from rims.

It is well known that tires, particularly heavy truck and bus tires, often become rusted or bound tightly to the rim and that the removal of a tire from a rim by the usual methods is a time consuming and laborious operation., Furthermore.

the tires or tubes, or both, are sometimes injured during the process of removal.

It is an object of my invention to provide an improved form oi'v tire press 'which will overcome some of .the drawbacks heretofore encounteredv in connection with prior art tire presses. M

It is a more specific object to provide an improved form of tire press in which the tire and rim are readily mounted and which will operate smoothly and relatively noiselessly.

Another object is to provide an improved form screw Il, non-rotatably carried bythe carrier 1 of tire,press, which issimple in construction, 4 l

exceedingly sturdy, and reliable in operation..

Briefly stated, in a preferred form of theinvention, I employ a fixed stem for carrying a rim head. A stripper head carrying stripper means such as lingers is mounted for bodily movement toward and from the rim head and is preferably guided on the fixed stem. The stripper head is moved by suitable means, preferably hydraulic piston and cylinder means, so as' to provide for relatively powerful, smooth, and readily -controlled action. v4In the "preferred form the tire stripper assembly 'is' movable as a unit to various positions of adjustment so as to readily adapt the tire press to tires of diil'erent sizes withoutthe necessity of. bodily lifting tires and rims.

In the drawings which show, for illustrative purposes only,`a preferred form of the invention- ,i

Fig. 1 is a central,- vertical, sectional view through a tire press, illustrative of the invention;

Fig. 2 is a right-hand view in elevation of the tire press shown in Fig. 1;

Fig. 3 is a sectional view, taken substantially in v the plane of the line 3-3 of Fig. 1;

Fig. 4 is a sectional view, taken substantially in the plane of the line 4--4 of Fig. 1.

In that form of the invention herein specificallyv disclosed, I may employ a base or floor 5 carrying an upstanding frame 6 thereon. The frame preferably supports the operating parts of the press. The frame acts asl a,A support for a carrer 1 which, in the form shown, has ilat slide- Y ways 8-8 for coaction with the inner guideways yand projecting through the top of the frame 3. l

A handwheel i2 having along, threaded boss or stem I3 is engaged with the screw lvl sovthat when the hand Vwheel is turned the carrier may be adjusted up and down to take care of `tires of various sizes, as will Vbeclearly understood.v

The carrier. 1` has a guide stem I4 nxedly mounted thereon. Theguide stem may have a shoulder l5 to abut the carrierat one side, and a nut YI5 may be threaded on the stem at theopposite side of the'carrier so as to rigidly and securely clamp the stem to the carrier. rihe stein Il preferably at the Aend carries a rim head I'I, which may be in the formof a Welmoed plate I8 having a proiecting'rlangev I9 to pilot the rim 20 of a tire and position the edge thereof against the plate I8. The rim head is preferably removably mounted on the stem `H and it -may' be held thereon as byl means of a two-part collar ZI, which has circumierential iianges 1l tting into grooves 23 in the stem. 'lhe rim head. may nave a counterbore 24 4at the end to rit over a part of the collar and holdthe two parts thereof in Y stripper head may-have a long bearing sleeve 21 to sildaoly nt over the stem I4, whereby the stripper head will be guided effectively on the stem andthe strlpper'means will remain in periect concentricity wlth'the rim head. The stripper head carries stripper means, which in the iorm.

shown consists ora plurality oi stripper nngers 28 pivotaliy mounted at "L9 between ears- 3u on a part of the stripper head. The stripper lingers wardly under the inuence of the springs 3|.

Means for moving the ngers radially outwardly may take various forms; for example, a cam ring 36 may berotatably secured to the end' of the flange 35 as by means of angle brackets 31, and the cam ring may carry cams 38 Whicharefso formed and positioned as to'engage beneath the iingers when the cam ring is rotated. The cam ring may be provided with a handle y40 for oscillating the same so as to shift the cams 38 lfor mov.

, head by means preferably in the form of hydraulic piston and cylinder means. In the form illustrated, the stem I4 carries a rear projection or piston rod' 4|, which carries a xed piston 42 at the rear end thereof. A cylinder 43 receives the piston 42 and lthe piston rod 4| extends through suitable packing and stufilng box means 44, as will be understood. Pressure iiuid is con- 1 ducted to and from the cylinder at opposite sides of the piston 42 in suitable fashion; for example, n n the rod 4| may b e provided with longitudinally extending bores 45-4'6 which open into the cylinder at opposite sides of the piston 42. Pressure piping 41 serves to connect the bores 45-46 to a four-way valve 48, which is in turn connected to a source'of pressure fluid and to exhaust.

The cylinder 43 is rigidly connected to the necting rods 49-49, which latter preferably extend through guide bores 50-50 in the carrier 1 and thus serve as further guiding supports for the stripper head during its reciprocating movement.

The operation of the device is as follows: n The rimhead may bemoved toward the left `and the two-part collar 2| removed from the shaft, after which the rim head itself may be slipped oiI the end of the shaft. A tire and rim, as shown in dot-dash lines in Fig. 1, may then be rolled into place, of course without the necessity of lifting the tire and rim from the oor, and

the rim head then replaced on the stem I4, the two-part collar put back in place, and the rim head moved toward the right to secure the collar in place, as heretofore described. If the size of the tire is such that the rim head I9 is not concentric with the rim of the tire, the hand- `wheel l2 may be actuated so as to raise or lower the entire assembly so that the rim head'will t into the rim without the necessity for manual lifting of the tire. The cam ring actuator 40 is then moved so as to cause the cams 38 vto position the lingers just outside oi the rim and in position to engage the tire side walls. Thereafter, the valve 48 may be shifted so as to allow pressure fluid to enter the passage 45 and pass linto the cylinder 43 at the right-hand side of `the piston 42. The :duid pressure will then force the cylinder and, through the connecting rods `49, the stripper head toward the rightr and if the rim is not already on the rim head, the ngers lwill force the rim thereon, and thereafter the stripper ngers will cam themselves down into' the space between the rim and the tire walls and will also be urged inwardly by the springs 3| (the cam ring 36 having meanwhile been rotated so as to remove the cams 38 from beneath the stripper fingers). Further movement of the stripper I head will break the tire loose from the rim and gently force it completely on of the rim.

Since the rim is held relatively stationary, there will be no substantial jai` or noise when the tire finally breaks loose or passes entirely from the rim. 3When hydraulic pressure is employed, the hydraulic iluid in the cylinder 43 will have more or stripper head, as by means of a plurality of conthe case if the rim head instead of the stripper head were the moving member.

After the tire has been stripped from the rim, the valve 48 may be shifted so as-to return the cylinder and with it the stripper head to the -position shown in Fig. 1. The rim head may then be removed and the rim from which the tire has just been stripped may then be taken off of the rim head and the foregoing procedure followed with the next tire.

It will thus be seen that I have provided an exceedingly simple, sturdy machine for removing tires from rims. It ls to be understood that, whilethe adjustable feature including the handwheel |2 is a great convenience, the broader features of the invention are not hunted to any adjustable means.

Certain featuresA disclosed herein are shown and claimed in application of Plumeau and Ottoson, Serial No. 451,518, flled July 18, 19,42.

While the invention has been described in considerable detail and a preferred form shown, it is to be understood that various changes may be made within the scope of the invention as defined in the appended claims.

I claim:

1. In a tire stripper, a xed central stem, a cross head carrying said stem, a rim head removablycarried by the end of said fixed central stem, a stripper head having a, central guide passage fitting said stem and guided thereby for longitudinal sliding movement thereon, tire stripper means carried by said stripper head for engagement with a tire, a plurality of actuating bars passing through and guided by said cross head and secured to said stripper head for actuating the latter, and uid pressure actuated means located in rear of said cross head and connected to said plurality of actuating bars for actuating the latter to move said stripper head longitudinally on said fixed centralstem, for the purpose set forth.

2. In a tire stripper, a frame, a cross head mounted thereon, a fixed central guide stem on said cross head, a stripper head having tire stripping means and a rim head for engagement with a tire rim, one of said last mentioned heads being ixedly but removably secured to vsaid central guide stem and the other of said two last mentioned heads having a central guide opening slidably fitting said fixed stem for sliding movement thereon, a plurality of vactuating bars passing through said cross head and parallel to said central stem and secured to said head having said central guide opening slidably tting said stem, and means in rear of said cross head for moving said actuating bars to move said head secured thereto longitudinally'on said ilxed stem.

GEORGE H. MITCHELL.

REFERENCES CITED The following references are of record in the file of this patent: v

UNITED STATES PATENTS Number Name Date 1,352,722 Caldwell Sept. 14, 1920 2,228,086 Rodgers Jan. 7, 1941 1,724,813 Weaver et al Aug. 13,1929 1,170,612 Covey Feb. 8, 1916 1,964,119 Hendry --.June 26, 1934 1,879,331 Kulp et al Sept. 27, 1932 870,039 Lease Nov. 5, 1907 887,973 Smith et al May 19, 1908 1,641,083 Hite Aug. 30,1927 

